Lennox, J. 1985. The deceptively simple postulates of Professor Robert Koch. The American Biology Teacher 47:216-221. (This article discusses how Koch’s postulates are used to identify and confirm pathogens that cause infectious diseases in humans and animals. Sometimes this is a difficult process, for example, in the case of Legionnaires’ disease.)

Ringel, S. M. 1968. Demonstration of Koch’s postulates. The American Biology Teacher 30:527-528. (This article outlines how to demonstrate Koch’s postulates for another plant disease, green mold rot of oranges which is caused by a species of the fungus Penicillium. Green mold rot is a common postharvest disease of citrus fruit, so this is another one you may find in the grocery store.)